The conversion of carbonate to urea is…
a) slow and exothermic
b) slow and endothermic
c) fast and exothermic
d) fast and endothermic
How much water is required to dissolve 1 gram ammonia to non-toxic level?
a) 50 ml
b) 500 ml
c) 1 ml
d) 100 ml
Explanation: ammonia is very toxic that’s why it requires more water to dilute it.
Animals which excretes ammonia as primary nitrogenous wastes are called……
a) ammontelic
b) uricotelics
c) ureotelics
d) nitrotelics
Explanation: Most aquatic animals including protozoans, crustaceans, Platyhelminthes, cnidarians, poriferans, echinoderms, fishes, larvae/tadpoles of amphibians are ammonotelic.
Which of the following animals are ammonotelics?
a) most fishes and protozoans
b) sponges
c) coelenterates and echinoderms
d) all of these
Explanation: all these animals live in large supply of water and do not face any sort of water deficiency for the dilution of ammonia.
Why marine and terrestrial animals convert ammonia to urea?
a) they less developed kidneys
b) they could not afford to waste water
c) they have much supply of water
d) all of these
Explanation: these animals lives in area where fresh water supply are limited and could not waste water by converting ammonia to nontoxic level
How many times urea is less toxic than ammonia?
a) 100 times
b) 1000 times
c) 10000 times
d) 100,000 times
